Seal for a joint or juncture – Seal between relatively movable parts – Relatively rotatable radially extending sealing face member
Patent
1987-11-23
1988-09-13
Footland, Lenard A.
Seal for a joint or juncture
Seal between relatively movable parts
Relatively rotatable radially extending sealing face member
277134, 277215, 277 53, F16J 1516
Patent
active
047704241
ABSTRACT:
A seal that is suited for use in the ends of a double row bearing for front wheel drive automobiles has a seal case which is pressed into the end of the outer race for the bearing. The case carries a seal element, which is formed from an elastomer or some other flexible material, and this element cooperates with a shield that is carried by the inner race of the bearing, all to establish a barrier that retains a grease-type lubricant in the bearing and excludes water and other contaminants. The seal element actually creates three barriers along the sealing surface which has both axially and radially directed portions. The first is as a primary labyrinth which encircles the axial portion of the sealing surface and contains pumping cavities which direct lubricant that enters then back toward the interior of the bearing. The second is along a dirt lip that extends toward and contacts the axial portion of the sealing surface at an oblique angle. The third is along a secondary labyrinth which is located along the radial portion of the sealing surface and has a groove that opens toward that surface. The groove is filled with the grease-type lubricant that further spans the space between the secondary labyrinth and the radial portion of the sealing surface to prevent contaminants from entering in that region. In addition, the seal may be provided with a flinger which is located radially outwardly from the secondary labyrinth and projects axially beyond the radial portion of the sealing surface.
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Footland Lenard A.
The Timken Company
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